We propose a novel probabilistic method based on the Hid-
den Markov Model (HMM) to learn the structure of a Latent
Variable Model (LVM) for query language modeling. In the
proposed LVM, the combinations of query terms ...

The Relevance Model (RM) incorporates pseudo relevance feedback to derive query language model and has
shown a good performance. Generally, it is based on uni-gram models of individual feedback documents from
which query ...